Fuel oxygen reduction unit with level control device

A fuel oxygen reduction unit for an engine comprising:

• a contactor including a fuel inlet that receives an inlet fuel flow and a stripping gas inlet that receives an inlet stripping gas flow, the contactor configured to form a fuel/gas mixture;
• a separator that receives the fuel/gas mixture, the fuel oxygen reduction unit defining a circulation gas flowpath from the separator to the contactor;
• and
• a level control device comprising a control device fuel inlet in communication with a fuel source, a control device fuel outlet in communication with the fuel inlet of the contactor, a spool movably disposed within the level control device and having a first spool end and a second spool end, a fuel/gas mixture pressure reference portion in communication with a fuel/gas mixture pressure and the first spool end, a separator edge pressure reference portion in communication with a separator edge pressure and the second spool end, and a spring in communication with the first spool end, wherein the level control device controls an amount of the fuel/gas mixture inside the separator by regulating the inlet fuel flow to the contractor.